U-233 is fissile and has been used for a bomb.
Yes, I'm well aware of that (minored in nuclear science while getting my PhD in chemistry). But the reaction characteristics of the two isotopes are different, and 233 is NOT the isotope used in U-Pu "burner" and/or "breeder" reactors reactors. That is 235. And for an article that claims to be authoritative, that mistake is NOT one that should have been made.